Higurashi no Naku Koro ni - localized as "HIGURASHI When They Cry" - is a series of doujin sound/visual novels. It's a mystery series, and a very confusing one at that. It's also well known for getting pretty creepy and at times incredibly so.
There are a total of two series, each split into two halves:
1a) Higurashi no Naku Koro ni - The original. It's the "Mystery" half of Higurashi's story. It gives you all the questions but very, very few answers. As the author put it himself, there are some very important "keys" hidden throughout each novel (notably the manga), but there are many more fake keys to trick you along the way.
1b) Higurashi no Naku Koro ni Kai - The "Solutions" half of Higurashi's story (indeed, the title translates to "When the Higurashi Cry Solutions"). This one gives you the answers to the first half's arc, and ultimately - in an incredibly epic finale - the ending of the series. All the loose ends are accounted for, which is rather surprising (due to the high amount of them in the first half). All of it ends with an epic finale.
2a) Umineko no Naku Koro ni - The original half of the second series. Umineko is a type of Seagull. Instead of being as much about myths and legends as the first, it deals a logic game about witches. It's way more confusing (but not quite as scary, honestly - it gets rather ridiculous in fact). It's similar to the Ace Attorney series (if you've heard of that).
2b) Umineko no Naku Koro ni Chiru - The "Breakdown" half of the second series, which is still being written (!). Instead of being the "Solutions" to all of the original's arcs, it delves deeper into the story, into the characters' pasts, and the cause and reaction to the events happening in the main story. There are 3 novels out of (presumably) 4 released.
The first three have also been turned into anime series, and they really emphasize on how violent the series is - indeed, it's well-known for its violence almost as much as its mystery factor.
Despite this, it's a great mystery series, but not one for the faint of heart or stomach.
Discuss, I guess.
